Value Collection R40321431 Set Screw 5/16-18 X 3/4 in

Product Description

The VALUE COLLECTION R40321431 is a 5/16-18 x 3/4 inch cup point set screw manufactured from Grade 18-8 stainless steel. Set screws are fully threaded fasteners with no head — they seat flush or below the surface of a mating part to lock components in place through direct contact or embedding. The cup point geometry concentrates clamping force at the contact face, creating a shallow indent that resists rotation and axial movement. This screw is driven with a 3/32 inch hex key. The 18-8 stainless steel construction offers solid corrosion resistance for indoor and moderate outdoor applications. It is a standard UNC threaded fastener used across mechanical, HVAC, plumbing, and electrical assembly applications.

Cup point set screws in this size range are commonly used to secure collars, pulleys, sprockets, knobs, and shaft-mounted components in light-to-medium duty assemblies. They appear in residential and commercial HVAC equipment, pump assemblies, valve actuators, and general mechanical assemblies where a low-profile, headless fastener is required. The UNC 5/16-18 thread is a widely used standard pitch, making this screw a common replacement or stock item for maintenance and repair work. Licensed tradespeople and maintenance technicians installing or servicing mechanical equipment are the primary users.

Key Features

• 5/16-18 UNC thread for broad compatibility with standard tapped holes
• 3/4 inch overall length provides adequate engagement depth for most shaft and collar applications
• Cup point geometry locks onto shafts and creates a positive indent to resist movement
• Grade 18-8 stainless steel construction resists corrosion in wet or humid environments
• 3/32 inch hex drive — compatible with standard Allen keys and hex bit sets
• Headless design sits flush or below surface for clearance-critical installations

Compatibility

Designed as a standard UNC set screw for use in any component with a tapped 5/16-18 through hole or blind hole requiring a cup point headless fastener.

Installation Notes

Installation requires a 3/32 inch hex key or matching Allen bit. De-energize or shut down any equipment before accessing shaft-mounted components. Clean and inspect the tapped hole for debris or damage before threading in the screw. Do not exceed the torque limits appropriate for 18-8 stainless steel in this thread size, and avoid overtightening, which can gall stainless threads — apply an anti-galling lubricant if reinstalling into stainless tapped holes.